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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2895dc0240b048c59841030ed7f9c6caac4a3a54a806d10897b88e8e8c395241' 
  AND token = 'FetOOPvs3MeTTdgzg0XQWAiMApJJjw1cgfHh8g6RqLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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