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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0588a4c932120ced2f16b5d4102e6c2c9d12aef400432fd172c9ec60b868c820' 
  AND token = 'My9wx1BZcuUyVJRjl3S7YiniCU+ZrgL7SH9RYAY5pc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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