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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1464b447b4fec763ad9aa4715d4c4bfeb25ff5ec0a1f8f8250b7fd1cc00f1c91' 
  AND token = 'cxOyT15pTWLJQte160VQlu53ApzdiPEtRUljPEzB7HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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