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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb977c53fef10e6cb4be101edc59a8cb82897ec4f8e90e577fd7438dc80fb9a' 
  AND token = '6f6OWwm4VKHoQcmdHrrAONTfh+Uavft9LQnWxhrgm3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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