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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39376b661f77c5acb7c11dfa71d175bd1ecc27815c44c7444724f95e8a05295d' 
  AND token = 'Fh13l6sS3Hvn7Owm8sdD7bNXTDBC5EpJUT2NFAmTr3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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