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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fa46caefa1b8c64c5adc69c29e15e7b967be3e338bd9fd4112725383ba04fec' 
  AND token = 'k686vGCwxpbGmBzf5Vc3OsG+Oy3drUX7/ZmnrE3C0jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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