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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '931a098c5b61daa0ae4e1a68bc60674c09ae81a8cffbe9525bd9e4e23d86ed83' 
  AND token = 'Ce2qeBdIizsg61Be4crWFp5eEbw5I8SAgg76fJABclE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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