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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d710f7ecade2ac150a1de018eef0305964f5f4a79d446bb4a4f02886a433c1' 
  AND token = 'ro55hOVNHr4qZzcqQGacU1pIBNeGSogPc5j7TBB89a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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