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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee82ff1a71d479941422b89dcb50fed91ff6ed300bf96393296db77c6e4e8e6e' 
  AND token = 'ONFgAQvwIJEj66r3MMRng3diVM8m/zYHakwWeWUrJxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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