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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95b1eb65d7631617ddd3a198f74cf98af4d6d2738aa48d92ab239492b175983b' 
  AND token = 'O0kUC5okplYzWbo4eUwBzPhBQC8h0buZFoAvaoDu4Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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