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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5035068b0020f03aa4c1761b3a913ec59f64b963460fafe27f8fb7508b2ad71a' 
  AND token = 'MCCnmnrT4hvk8siOm0T2BWCaFHo2P7udN+T06VHVoRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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