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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca977fdd2c0e6fb0d73f4cd2f4bb9b07833cf6b99e95fb2ba69dd3209a8bf733' 
  AND token = '8xAkSsQE+xste0OukLAgBYLVTrPU3Ajvr9rRmIFA4SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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