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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd954b8df881495e3c3209468094bfb4c94a19b87ec7b922da3722d32c4aa21ad' 
  AND token = 'sR/omPEdYF0sRrSeTBCDEAXwpAX8wV6IJMsyxFIBqVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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