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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f5b7737f32decc28937cc156d7c23f105c3e32499e38381c957426ea5dc974d' 
  AND token = 'yZqYY88fQmFVYQXYBhiukQiBTg34TFen8hwThlIRrKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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