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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c064bef6f4ac9f50706818900b914ae08f76e3c1936763e23c7d78c95ad1907' 
  AND token = 'l6g8QdUNQReRHcUrCVfZ+DCaKzahOUGeF3rrydUD2w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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