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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd53ac3eaeedbed89bc30b0ac404e83107ea0b71f07c0a17f1d590d748a2bf0b3' 
  AND token = 'qCBNiN5ROii6Em75oJHV1Dq4/3ICy2KYokfGyzOVLBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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