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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebcc664c233d2d7594c5a6af70faff7f8d2d68e3dab4dc44c3900563be1a5658' 
  AND token = 'ri0vbYEa2v3dgXOqmGO1SzRIHTlUcOmBw5fHiqD/9K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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