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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2b737607d540a7f7cd9d6a682aa443843a70c1015162bc77bf7fa871475421e' 
  AND token = 'L6PAInYYknYxvxEUZXz5QiSPg5kIjb/AOR/5cO5qovM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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