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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a6dee474ce7fe4ccdfe7235b69a2bb02d181b1100e244a3e2c21bea7b1ecb32' 
  AND token = 'p9CqlczslTTphQOBz6E/g2Ah8lfY7yR8Jqj3AiFaht8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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