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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbce3e7b4317cbad9412c364abbc8b978beb4067a57130f5ae38bcdf4e6d86c2' 
  AND token = 'Xy2V7PgcxVwp21TLB+dA2fvwU42L6TEnE1KpjapAHXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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