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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed44e17d7a2248c18d5a20e871096e9d13f30441647c3ec5197f066a5b299c42' 
  AND token = 'TXh+1it3rtbHmTC+l5Sji6anatKWmuOs8tdgsP9O0ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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