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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '370a33783572a92326fedbe7320397134b0dcfffe33bc721c8aa3b4509c50494' 
  AND token = 'UfV7yVQclKsay4VKaHw6AkQPWgSVCtZr/VvwMuV2MLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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