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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aabd9cdf995c477c917f5afe4f8a5e85f9d80e357ca9fd3c51a78ad5bbb9d2bb' 
  AND token = 'y14W0EhxSmRd1hFO6HGUT6gYziV0CCYpNPer311mZ38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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