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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7855e17a71e32cbc6bfdacf7283267527d9f7e57f18867a29f5fdfe3d9a5973e' 
  AND token = '58P+FUfkVDEUPdsA5jreJu+5Kdm8JynCF/nytxp0xvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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