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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c52eb7139550e3f658495b8f973c6e453f50d0c9f7de0b033d9f946df003602' 
  AND token = '/s1Gs/c/HlmVgNrbCOlqtmR4nngFoVaLQty5oG0Y4Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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