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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd1a2b053f30fd68f7a6f9fe54ddf8f627a91ad2b613f38d87d5fcf257c1c41a' 
  AND token = 'wrQkPRaHmkWfQ/5D22kE7kXkJ27QKmJOwl9pbVwVP/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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