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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d62c10e584980dee71d201da215cf2f2a64251244d680a2e62492a32d3e871' 
  AND token = 'iMj3DopyyYFq4C5m3NYRuMMX7pMl4kQgOE+vUukyo6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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