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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c047f89695369683b58a811101cd249aef3a9ec7e62af8a23680d7123fe0614a' 
  AND token = 'm0zFSgcjjcUKYDBUOBTI3BbsHCrdyYT+EbWGf6T90k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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