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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcaad0a173b051965bec99982a797dc5c1f1e34b6eb6ac62d0cf32abb874bbb9' 
  AND token = 'L04xzhLeyLRm0fzCR92R05HD9jy+wLDehE7ye96TmbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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