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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a7446c424631a34cfe01d79e5553316253cb38f6e3898a7a180ee738b0b7c75' 
  AND token = 'rla/+vjrydI5b6EcsHu3yf9xGCd1He5atGKf1YKvszQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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