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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd2e3265359fe5354fe482e804b0af4978aeb996446c91c763c6c6fce40c413d' 
  AND token = 'v9kp72ahWagoFaC7UAD3OfQ1zEXkMJtPDdyKtcAIBfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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