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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd54523fc30d3b412335c433434f91a08e2cc3166c411138be5d18747266829af' 
  AND token = 'D9qNX/A2v7H7YVQI4GcSS1omdc0phiG1/7fwwJ0wUxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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