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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e53d2809e69c9df3c4485fbac337fa88907ba0dc067ddb879d5499ad77eeab5' 
  AND token = '1gs6yqabbSmhrFGpPNXTWntVj9apZhE/4uagH4GzE9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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