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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d51f17233b4153fb7d52cf3e4eefe317453689abb751abf929ca6278dabdb5' 
  AND token = 'pSmeemHzEkK5y0khBWLC7xThoNOEfOm92is5dwFfbBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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