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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '864cad690f05742737490ee0d6bced244b1512044a2d234057e03b3ed51142f0' 
  AND token = 'e9ZxDVuvuWvYiXYm94A0wi6yEHyqRzJzr/h51Phb0HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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