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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a3402e66965cd0931cadfbbe1fc1f2f55111a6aa39f5dd74d99d02fce77e6d' 
  AND token = 'ZnEhCvoMEPN4WPhjZgPr/dSbhjXI01kp7U6Ky4IMXsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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