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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44fbc9417c5b2e963fc0b60e7dbb2b9f6fd67f84cad55504be5a91c9df775e6c' 
  AND token = 'aaj/TXsIz8lGMTIE34SqEudw4xVrwOmTr9kBybo1/P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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