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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bef26dbd43fd6ea3c38c1f43a4e3dc5062ff8a91d448dacf74b272f4c925891' 
  AND token = 'tROA10nHo0P1cXXo3eCzlqo1AkeKkwNjlctuYN93+xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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