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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e47918cbaaaf7cd8b14eb458f8fc1cb72c352f26e968d0044efbb3740b89b3' 
  AND token = 'bkXy4iIxMp3a3MyNYTskwq2JjLG2hcS8KsdG0A816wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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