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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ed2c067464a25748e90e7d2a19d02c10d4a4d5d3584ebc4aea307669f1db0d5' 
  AND token = 'P1vKyUxtnmzJObkNlun41U4ivChWE/5BO8FLkKHKNko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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