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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5da8e8ab7b3714c7ba37aa1f5fc3990f117dc3d153ddc967ae7aa7dd7a047c' 
  AND token = 'b+gZ2VGgtNXxEJk497kIiLAWrJ5tPitoCZ/ULNN+6W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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