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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c559e4c45b072f8719caec00a3ed1c5d63d8438691875046ccaaa0b61e4d42d6' 
  AND token = 'qj9TCWgZyXPaxOquIPsUMe7IRJ9CHnodTxJHEvttvgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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