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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b583ab2609fbd435bd3882bbb359829b35ec49cf96e5ec77d47540144add314b' 
  AND token = 'xMm/YkAEpE7dAqQecujHLpOX7YOFUcli7sPMjhbbq/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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