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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84a015699d586aba001fabf0a237b410c52b7983a2289fc2f5f83ff8efb1ff7e' 
  AND token = 'zn5FgDz7kBqodvh30ESg4Hms1XOmklD7htp1RsHRrYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}