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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab53a92ee6ff381098b59539ac8be671eb301093b3b1450424cb04db6f6fec25' 
  AND token = 'h3H6FQHUGplHo+mVkQ3bUfWhQY+1sn6077eRPMdKzFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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