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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d29703e983858a9c1bae369a13789db32db42c278da7660953e9193cc76464' 
  AND token = 'aCGC5XkerOeMgeycMSBW2wejNFz5baV6/d8Om9SMXyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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