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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b983b6f4b2c14047849a484ecae46e98211d6a1c26009360ea2f0f747d6c9d64' 
  AND token = 'bfxG84Vs1aPVeqHNckaoJitlUnBchBVXxdV/Rg4K4hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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