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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b46b6a6680ac3f8d67397a9f5657b496bd8d35d717c45033d269a2c7e5498a' 
  AND token = 'c2Pu86ha+qyL5oTW1a80qTIGzn5nRc7f9DAKUIdF0tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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