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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2b62bdbd91f6afc5f15914330560c33de27a211985774dcd164b62c815d1e06' 
  AND token = 'zZ4tvYwMc4Vz9MQ0+um5bUxgVOXRSoA3nHEJ3yo4QcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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