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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55fcc4b93f98108409815e168cf654896b15a1b11a2951edc0a10ba80c64e961' 
  AND token = 'C5hh7382/NfizYx1SI+RozyZT1MV/oFkrygQxCheRYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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