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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2346e0c78b665549184db20507d19b3b8e143b223e1d32f25893910e92112c89' 
  AND token = 'P+U7ZaDKomNzAKGOXT7YeFM1cWihingd8cxb3iCrWcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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