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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '969500a651003818de30f00162ac659dd147eef0acd9543e4b4a959096bec383' 
  AND token = 'FrRA2SAN8ZeqG6FpGGlTrMraT7kKAPFKmWYuaKQxyTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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