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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '663d67d9492967d3916f2b9761b10950796da5c90b31177da1dc340476d16039' 
  AND token = 'ddd51T9NMnG0pDyhH8tGHVMRBeQu7EMCdr1XBb7L240=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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