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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6968077603f64e71ecc2b1d878e126933a8715f281fbc0991eb5eac55d55afe' 
  AND token = 's3vXJiodsf+e/Mvff/qqj33IPtNQqzWvP60W5WabV6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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