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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c18923ee1e2f47ff66197be74bbcf79652bc9f832aa712428d520fc534a47b3' 
  AND token = 'eAIaGeHp63WHODUnNLk3Qs+jKbrTwJNe0yH9YViqj3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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